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    <title>Document</title>
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<script>
    //算术运算符
    //自增x++:x=x+1; 自减x--:x=x-1;
    let x=1,y=10,result;
    result = ++x+(++y)+y+x--+x+x;
    //2+11+11+2+1+1
    console.log(x);
    console.log(y);
    console.log(result);
    console.log('--------------');
    //加号+两端中有字符时会自动将两个操作数进行拼接
    let num1 =123,num2 ='hello';
    let res =num1+num2;
    console.log(res);
    //赋值运算符
    //+=： a+=b > a=a+b;
    let a=10,b=20;
    console.log(a+=b);
    //位移
    let n1=-9,n2=2;
    console.log(n1>>n2);
    let m1=9,m2=2;
    console.log(m1<<m2);
    //等于和全等
    let varb1=123,varb2='123';
    console.log(varb1==varb2);
    console.log(varb1===varb2);
</script>
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